<template>
    
<!-- 头部区域 -->
    <el-container class="home-container">
      <el-header>
          <div>
              <img src="../assets/heima.png" alt="">
              <span>电商后台管理系统</span>
          </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!-- 主题区域 -->
      <el-container>
          <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px':'200px'"> 
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <!-- 侧边栏菜单选项 -->
            <el-menu
             background-color="#333744"
             text-color="#fff"
             active-text-color="#409eff"
              :unique-opened="true"
              :collapse="isCollapse"
              :collapse-transition="false"
              :router="true"
              :default-active="activePath">
             <!-- 也可以写 :unique-opened="true"  是否只保持一个子菜单的展开-->
             <!-- 一级菜单  index="item.id表示唯一值id在展开列表时，能够区分展开哪一个列表 -->
             <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
                 <!-- 一级菜单的模版区域 -->
                <template slot="title" >
                   <!-- 图标 -->
                 <i :class="iconObj[item.id]"></i>
                 <!-- 文本 -->
                 <span>{{item.authName}}</span>
                </template>
                 <!-- 二级菜单 -->
                <el-menu-item :index="'/'+subItem.path" 
                 v-for="subItem in item.children"  :key="subItem.id"
                 @click="saveNavState('/'+subItem.path)">
                    <template slot="title">
                        <!-- 图标 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文本 -->
                        <span>{{subItem.authName}}</span>
                    </template>
                </el-menu-item>
              </el-submenu>
            </el-menu>
        </el-aside>
        <!-- 右边内容 -->
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>

</template>

<script>
export default {
   data(){
       return{
        //左侧菜单区域
        menulist:[],
        iconObj:{
            '125':'iconfont icon-user',
            '103':'iconfont icon-tijikongjian',
            '101':'iconfont icon-shangpin',
            '102':'iconfont icon-danju',
            '145':'iconfont icon-baobiao'
        },
        // 是否折叠,默认不折叠
        isCollapse:false,
        // 被激活的链接地址
        activePath:''
       }

    },
   created(){
       this.getMenuList()
       this.activePath=window.sessionStorage.getItem('activePath')
   },
   methods:{
       //退出操作，清除session记录    
       logout(){
           window.sessionStorage.clear()
           this.$router.push('/login')
       },
       //获取所有的菜单
       async getMenuList(){
           const {data :res}= await this.$http.get('menus')
           //判断状态是否成功
           if(res.meta.status!==200) return this.$message.error(res.meta.msg)
           this.menulist=res.data
        //    console.log(res);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
       },
        // 点击按钮，实现菜单的折叠                                                                                       
       toggleCollapse(){
          this.isCollapse=!this.isCollapse
       },
       // 保存链接的激活状态
       saveNavState (activePath){
           window.sessionStorage.setItem('activePath',activePath)
           this.activePath=activePath
       }  
   }
}
</script>

<style lang="less" scoped>
   .home-container{
     height:100%;
   }
   .el-header{
     background-color: #373D41;  
     display:flex;
     justify-content: space-between;
     padding-left:0;
     align-items: center;
     color:#fff;
     font-size: 20px;
     >div{
         display:flex;
         align-items: center;
         span{
            padding-left:10px;
         }
         
     }
   }
   .el-aside{
    background-color: #333744;
    .el-menu{
        border-right:none;
    }
   }
   .el-main{
       background-color: #eaedf1;
   }
   .iconfont{
       margin-right:10px;
   }
   .toggle-button{
       background-color: #4aa5064;
       font-size: 10px;
       line-height: 24px;
       color:#fff;
       text-align: center;
       letter-spacing:0.2em;
       //鼠标放上去是小手
       cursor:pointer;

   }
  
</style>

